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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873d8f55f888d0a99bf5a182909d7b8fd30bddec3249be4ab6a273ab9085a490' 
  AND token = 'a1yag1lR88Hig4G1rrZWJJW99Yp/Lpfq4rLsr53fzP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}